How do I find the rgb values for colors defined by their name: e.g. blue, green, yellow etc.

Peter Haworth pete at lcsql.com
Tue Dec 10 17:24:03 EST 2013


Thanks Jan, I will convert to using that method.

Pete
lcSQL Software <http://www.lcsql.com>


On Tue, Dec 10, 2013 at 1:09 PM, Jan Schenkel <janschenkel at yahoo.com> wrote:

> Hi Richard et al,
>
> There's an even faster method, based on the fact that the graphic effects
> always convert colour names to rob triplets.
> See: <http://quality.runrev.com/show_bug.cgi?id=10253>
>
> Here's a script to compare the average speed of the colorOverlay["color"]
> method versus the effective backPixel method:
> ##
> on mouseUp
>    local tColorName, tColorRGB1, tColorRGB2, tStart, tTime1, tTime2
>    repeat for each line tColorName in the colorNames
>       put the milliseconds into tStart
>       set the colorOverlay["color"] of the templateGraphic to tColorName
>       put the colorOverlay["color"] of the templateGraphic into tColorRGB1
>       put the milliseconds - tStart & comma after tTime1
>       put the milliseconds into tStart
>       set the backgroundColor of the templateGraphic to tColorName
>       set the backgroundPixel of the templateGraphic to the effective
> backgroundPixel of the templateGraphic
>       put the backgroundColor of the templateGraphic into tColorRGB2
>       put the milliseconds - tStart & comma after tTime2
>    end repeat
>    delete char -1 of tTime1
>    delete char -1 of tTime2
>    --
>    answer "colorOverlay[color]" && average(tTime1) & return & \
>          "backgroundPixel" && average(tTime2)
> end mouseUp
> ##
>
> On my machine, the output was
> colorOverlay[color] 0.001812
> backgroundPixel 0.005435
>
> Incidentally, this is the method I will include in the next revision of
> Quartam Color Library.
> That is a free/open source library, available under the
> commercial-friendly LGPL license.
> See: <http://www.quartam.com>
>
> Cheers,
>
> Jan Schenkel.
>
> =====
> Quartam Reports & PDF Library for LiveCode
> www.quartam.com
>
> =====
> "As we grow older, we grow both wiser and more foolish at the same time."
>  (La Rochefoucauld)
>
> --------------------------------------------
> On Mon, 12/9/13, Richard Gaskin <ambassador at fourthworld.com> wrote:
>
>  Subject: Re: How do I find the rgb values for colors defined by their
> name: e.g. blue, green, yellow etc.
>  To: use-livecode at lists.runrev.com
>  Date: Monday, December 9, 2013, 5:21 PM
>
>  Peter Haworth wrote:
>
>  > Hi Jim,
>  > Sent this earlier but it didn't make it for some
>  reason.  This is a
>  > function that some kind person on the list gave me a
>  while back:
>  >
>  > *function* RGBFromColorName theColor
>  > *   if* theColor is not a color *then*
>  *return* "Error: not a color"
>  >
>  >    *create* invisible button
>  >
>  >    *if* the result is not empty *then*
>  *return* "Error"
>  >
>  >    *set* the backgroundColor of last button
>  to theColor
>  >
>  >    *set* the backgroundPixel of last button
>  to the backgroundPixel of last
>  > button
>  >
>  >    *get* the backgroundColor of last button
>  >
>  >    *delete* last button
>  >
>  >    *return* it
>  >
>  >    *end* RGBFromColorName
>
>  For greater robustness and a modest performance boost you
>  could use the
>  templateButton rather than creating a new physical button.
>
>  --
>    Richard Gaskin
>    Fourth World
>    LiveCode training and consulting: http://www.fourthworld.com
>    Webzine for LiveCode developers: http://www.LiveCodeJournal.com
>    Follow me on Twitter:  http://twitter.com/FourthWorldSys
>
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